I hold these a lot whether its CJ or actually a different format I have made where I fund prizes myself and they can be substantial.
It can be difficult depending on time of day for ppl to be down. But when you charge a fee, then it may be even harder. I give ppl wrapped gifts when they arrive, ranging from 10k bells or a joke gift to 99k bells or a kimono stand (220k)
Not saying anyone should or should charge anything, usually ppl give me bells or NMT for free without asking, yesterday got over 100k in bells and a NMT for holding one autumn fishing event.
Just explaining how it has worked for me on here. Always had great experiences with the players, hope ppl DM'd you and came over!!