It's easy to see faults of others, housholder Konrad, and interested.
Aside of some aspects what belongs to others, already mentioned here, one should not forget that lay people assisting monks are not assistance of other lay people and actually have no duties toward them.
When one enters another space with a costumer attitude, such will never be of benefit, especially in regard of Dhamma, so it's good to:
Better to Give than to Consume and a demanding mind, thoughts of "I have a right"... such is a mind of great wrong view and not really at a stage to gain any Dhamma.
It might be sometimes hard to access the Sangha but one should not forget that such is related to ones own debts in the world as well as Upanissaya. Nobody needs, has the duty, to give or provide you anything, even if you would be worthy of receiving gifts and hospitality.
Some hints how to approach lay - supporter of the Sangha, if that is even the matter here, wishing to do merits, some hints have been given here: [Q&A] Details on what may be given as alms (Tips for alms-giving)
- A tip in reagard of organised monasteries
- Stewards, monastery and Monk helpers
Good to note that centers and communities who serve visitors like gods, could do such very conscious in advanced for later gain. So it's importand to reflecct why one actually goes out to a buddhist center: To make merits or to use of old? In the second case, better to access markets and a person who is after consume will naturally only meet those trading in Dhamma, seldom find ways to make real fruitful merits, lacking Upanissaya, right view.
If wishing to run a center, help a monastery a question:
How should a theravada centre approach the lay people for support? is good asked toward wise. If someone making use of possible gifts, an answer "how should they act toward me" is total wrong placed, right at the beginning.
(Note that this gift of Dhamma is not dedicated for trade, exchange, stacks or entertainment but as a means to make merits toward release from this wheel)