Another way is to write in your description - "Serious bidders/buyers only please" or "Please don't buy unless you can pay as a strike will be issued."

Please do NOT do that, it looks so unprofessional and would probably cause those of a perverse nature to make their payment as late as possible! Why put the idea into their heads that there are such things a frivolous bidders who don't pay.

I haven't paid a listing fee for a long time, if I have used up all 40 on one selling id I list on another id, no way would I pay $1.50 to list anything at auction and certainly not a relist.