yeah, i agree, dont feel guilty but at the same time explain the extra costs involved so that may help them understand, rent, insurance etc. They should understand. However, you may still lose some because they came to you (most likely) because of the 35 an hour, they may not be able to afford the rest. If that does happen, it isnt your fault, your growing, thats a good thing, you wont grow at 35 an hour for anyone in that building.