A lot of things are really just your perception of them (general you, not specifically). Have you sat everyone down and talked to them about it? They can't know what's going on with you if you don't tell them.
Have you made less expensive suggestions of your own? Going for a walk, bike ride, picnic (in season), helping prepare a meal together, cuddle time while watching a movie, board/card games are all cheaper (or free!) alternatives to money items
There are as many ways to do polyamory as there are people practicing it!