my friend and i share the duties as bom chair. we did it last year and have continued this year. the guild does pay for the fabric or we use donated fabrics when available. we charge $1 to each member participating. when choosing the block we try to vary the complexity and the type of block so that all members have a chance to participate. some members like it simple, some like to be challenged. we have bom most months of the year and like most of the previous explanations we have a drawing using the people who return their finished block the following month.
our guild is very large, over 200 members, but participation to run things is very limited. that's why we are doing the job for the second year. however, doing the same job for 20 years seems tooooooooo long. maybe time for someone else to step up and volunteer to give this person a rest.
i know there are members who do not participate for the same reasons you mentioned. the workmanship isn't always up to everyone's standards. if you feel this way then you have the option not to participate.