I’ve got a bumper I’d like to post in services. My question is can I offer bumper and ask for grushee spots in exchange instead of fg? I often see vacant unused grushee spots go wasted and it just seems like such an inefficient waste. I’d think most grushee a would like the idea of not having to pay a bumper in fg. Any thoughts?

Almost any grusher would be okay with this, can't imagine anyone saying no unless the spots are already taken

It depends a lot on current supply and demand of bumpers. Some grushers will agree to grush your filler for free. However, I've met two grushers who were very strict about requesting a payment for their services, even though they had multiple free slots.