Is there any way to know that the buyer has accepted someone’s offer so that i donot apply in vain
Not that I know of. I still don’t think it’s in vain if you are really a good match, though. Some buyers end up purchasing a few different gigs based on one offer so they have some to compare. Others purchase a gig that doesn’t work out, and they may content the next person in line to use their refund.
yes u r right! got it