When we play RPGs, we tell stories. For some it’s a fun consequence of the characters’ exploits, while for others it’s the whole point of the game. These stories can often have great power for the groups who create them, creating characters more personal and compelling than any novel ever could. It’s natural, then, to want to share these stories outside the group. The problem here, really, is that a tabletop campaign is a big, extended instance of “you had to be there”. As fun or dramatic or gutwrenching as it was at the time, you cannot recapture those feelings by turning your campaign into a novel.