Lay people often don't know the difference between a minor offence and a more serious offence. They may be shocked when a monk drives a car (dukkata, or no offence depending on your POV), yet willingly donate cash to that same monk, which enables him to buy one (nissaggiyā pācittā) or run it. Receiving money is an offence for the monk and donating it is akusala kamma for the donor.
It is true that most monks nowadays accept and use money, only well-trained monks avoid it, as do all the western disciples of Ajahn Chah that I know of. This is why it is so shocking to see Ajahn Brahm engaging in trading his time in return for monetary donations to the Sangha.
Hinting is allowed for one who has nowhere to live,¹ but it is entirely the lay community's responsibility to raise funds for building monasteries if they wish to support monks and nuns. If lay people invite a monk in general terms to ask for whatever he needs, he can say that the Sangha needs a new Dhamma hall, or whatever. The lay community can then organise Dhamma talks or retreats, or entertainments, and use the donations thus received to build the Dhamma hall.
¹ Visuddhimagga — 113. As to the robe and the other requisites, no hint, indication, roundabout talk,or intimation about robes and alms food is allowable for a bhikkhu who is purifying his livelihood. But a hint, indication, or roundabout talk about a resting place is allowable for one who has not taken up the ascetic practices. 
114. Herein, a “hint” is when one who is getting the preparing of the ground, etc., done for the purpose of [making] a resting place is asked, “What is being done, venerable sir? Who is having it done?” and he replies, “No one”; or any other such giving of hints. An “indication” is saying, “Lay follower, where do you live?”—”In a mansion, venerable sir”—”But, lay follower, a mansion is not allowed for bhikkhus.” Or any other such giving of indication. “Roundabout talk” is saying, “The resting place for the Community of Bhikkhus is crowded”; or any other such oblique talk.