Why do I keep trying when I know that it won't really matter.

Well I did it again, so here I am bitching again. I try to do these things to help the ex save money but I know she won't be happy with the finished product and it will wind up costing me much more that my time and effort is worth. She and my daughter saw a picture holder with the saying from a song by Rascal Flatts. She didn't even know the song or the reference but since my daughter is a fan she did and her fiancée is a truck driver. She liked it but they didn't get it. The next time I took her to Canton because she wanted to go. That was another waisted trip because she bitched the whole time and she still didn't get it, probably because it cost too much and she wanted me to do it but not screw it up and make it look better. In my eyes I did and spent too much in getting materials I didn't have but the extras I can use again on other projects. I took her to the store and told her about the things but she wanted the nails sunk in and wood filler put in which had to be painted and not stained so it wouldn't show and then it would also not be what she wanted. I was fighting a losing battle. Still I did the project and I know my daughter would still love it. I hung it in her(my daughter's) room, not the ex, if the ex decides it is acceptable. There it will stay because I told her about the problems in making it and what I did, but that is not what we talked about so she was pissed and I sent her a picture and told her that that is what it looks like, as is and if she doesn't like it she can get the one at Canton. That also makes me pissed and she wants to throw a shower for her and said we need to pay for it which means me but she is full of shit. If she wants it then she will have to throw it and I am out of the picture on that one since I told my daughter I would get her so much money for the wedding and that I have already done. My daughter understands but the ex does not know what ex means.