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My thought, as someone who has only seriously 'invented' one chess variant (which is only a minor variation of a 400-year-old variant), is that I don't like proliferation that much.

I think the joy of inventing a Chess variant is the joy of being able to develop opening, midgame, and endgame theory for the new game and new rules.

This is why I only have invented a single chess variant, but I made it one I extensively tested using Zillions before making public, one where I developed some opening theory, and one that I spent hours having the computer play against itself in computer-vs-computer games (usually two different programs playing each other) to creating interesting mating positions.

I personally prefer quality over quantity; 90% of everything is crud, but I think it's better to make just a single variant where it's fully fleshed out: The game includes a game courier preset, a zillion's implementation, in addition to a clearly written description of the rules. Ideally, the game should have some theory established, such as the value of the pieces in the variant, some opening theory developed, and even some mating problems.