Ensure you have several hundred dollars worth of local currency, which is easy to get in Kathmandu. Take more than required if you can, especially if you have gadgets you want to charge regularly, cameras being the most common. It often costs 3 USD per hour per item to get charged. Water is expensive so a UV system and filter might save you money, although it costs time and up-front cost. Boiled water was barely cheaper than bottled, up to 5 USD per litre. I carried little water because we stopped for tea and lunch so liquid was available almost all the time. tea costs the same as water and tastes better (to me) - not carrying it made it taste even better!
I used a (good) cell phone camera which required little charging and, most usefully, took along charging blocks (essentially large batteries with USB charging) so I didn't use any charging services. This paid for the charging blocks.
I kept my kit bag below 10kg, difficult with my cheaper sleeping bag. Thus I didn't take some kit I would have liked to. However, many people on my trip seemed to think that the system was volume-based, using compression bags to cram amazing amounts of stuff into their bags. Many were at 13-15 kgs, only one kept below 10. The general vies was that it was ok "Because it is just a couple of USDs per kilo charged on the plane".
Needless-to-say, this conveniently ignored the fact that the porters had to carry the bags. On previous trips, Peru for instance, each bag was weighed and rejected locally if the weight was too high, causing people to leave stuff behind or put it in their day bags. None of this happened to us, my bag was crushed and squashed to compensate for the unsquashable bag that it was carried with. This was mostly ok but it did break my shaver and cause things to get wetter when it snowed.
On this last point, USE a waterproof kit bag or carefully put things in good plastic bags, the porters took the plastic covering for the kit bags and used it on themselves when the bad weather hit.
If you get hungry more than most, take a lot of power bars or beef jerky to supplement meals, this will fill gaps and save a fortune, it often 20 USD per day to eat.
Overall, the experience was poor value for money, the helicopter we were almost obliged to hire, cost 600 USD per person, with 100 USD returned to us for the unused plane flight to Lukla at the start of the trip.
This was considered well worth it by the group in general but, ironically, despite the continuous "Lucky we took the helicopter", it was more of an insurance policy because the flights continued the next day and we may well have flown in 1 or 2 days later. It may also have cost us the goal we sought, Everest base camp.
Because we started a day late, our schedule was almost the original schedule (Note: the extra day at the end was maintained, not for us but just in case the return flight was also delayed and we may have missed our flights home, which would impact Exodus).
This compression of the schedule meant less acclimatisation, which, for one person and her husband at least may have cost them the trip since she got serious altitude sickness and had to be helicoptered out.
When the cyclone hit, we were forced to go down the mountain. Has we started later, we would have skipped Gokyo, which would have made everyone unhappy at the time, but we would have, very probably, made it to Kala Pattar, the finest viewpoint for Everest, and possible even Base Camp. This may have had it's own issues of course.
Added to this that several people were ill from stomach problems, including me for the only time on any trek. Everyone obviously took precautions but the food is all provided by third parties and there is a lot of trust placed in their hygiene.
As pessimistic as the above may sound, I am happy to remember the beautiful sunny weather we had for the early part of the trip, the amazing views and scenery in general. I will still look back and be happy I went.