I submitted several games for HoF (only deity, except 2 gauntlets that I got 4th both time
), and I have participated GotM for more than 10 games now, so I think I can bring up some issues that stopped me from playing HoF and play only GotM and DC. Some of them will be very similar with Tabarnak's point.
1. Rules are not clear: I am not saying anything like this should be allowed, this should be banned, this feels like cheat, etc. It's just not clear at all. Moriarte, Maxym, and I had a short discussion at gotm57 after action thread about HoF rules and it seems that we had different 'HoF rules'.
For example, what I understood was that one cannot DoW and peace if one did have any lump sum gold deal, unless one takes AI's cap or half of AI's cities. Maxym said that he allows one lump sum gold deal break to be allowed (for example, to rush buy worker at the beginning) as the rule prohibits doing that "repeatedly". Moriarte says one can DoW without lump sum deal and get good peace deal continuosly and this is basically similar to lump sum trick and so-called tommynt style aggressive play. Then Tabarnak says it's not allowed.
At this point, I am not sure what's going on - clearly, I followed the most strict version and no wonder my submissions got accepted. But on the other hand, I could have done better if I could use some of those tactics.
I believe that it's safe to assume that those 4 players mentioned above (including myself) are fairly competitive players. The fact that such players interpret rules differently means that rules are just not clear enough. I personally prefer to have rules to allow everything except barb/self pilliage thing (as this one does not get diplo penalty and risk), but I won't argue for it here. My point is that, as long as we have clear rules or mods such as Tabarnak's suggestion, more people will participate.
2. Re-rolling for the best start: especially for lower level difficulty games, there's no chance to compete unless you get a great starting position. Lots of desert hills, next to mountain, marble, etc. More than that, if one does not get good ruins (early culture, pop, tech) one has to reroll. If you miss GL/Petra, no need to continue.
For me, this is just too much. I believe that rerolling lots of times for the best possible start and ruins is just complete waste of time. That's why I play gotm, and I think the number of games submitted for gotm and that of gauntlet show that there are lots of people who just don't like to reroll and want to compete and compare their games with the same condition, in particular the same starting position.