No you shouldn't "have to feel" that you must make something because they want you to, it's your time and if you don't enjoy doing the project then you should say no. But I'm not sure you still may feel quilty? Yet you may be able to get rid of the quilt if you ask to be paid big amount for your time, and if you buy the fabric and pattern since you need to get some of the thousands back you paid for that machine!