The amount you charge for the DE, you should be doing this tbh.
The amount RESELLERS charge for the DE... Don't confuse EZ-Flash for the resellers.
Their profit margins are a lot smaller per device than you'd probably think. They continue to support the devices even after the initial sales start to die down (resellers buy in batches and each reseller sale doesn't affect what has already been paid, so unless there's a steady restock, there's only random batches).
It's easy to lump everything into one category, but things aren't that simple, and the devs still need to get paid for active work. So spending their money to support a niche product that was designed by somebody else who created the problem.
The EZ Flash devices are designed and tested in OEM environments, and that's their operational target. If you decide to mod your system with something and it introduces some instability, that honestly just seems unfair in my eyes to expect them to pay out of their own pocket to fix a problem somebody else introduced with their mod.
I don't own a consolizer but I've just looked at the installation and I think I know why it doesn't work...
The clk signal is being replaced entirely, I'm assuming this is because the original signal is 4.194 which produces 59.73hz refresh (not a clean 60hz, which would result in tearing on a 60hz screen)
This essentially means the GBA is running ever so slightly faster in all aspects, because they're replacing the clk to make the GBA output 60hz.
Again, this is an issue introduced by the consolizer kit and would also likely have the same result on the EZ Flash DE as those clk speed mods that allow people to play games at 1.75x speed etc. But that does mean it is indeed likely something they can patch with software opposed to my original thought of it being possibly power rail related.
*edit: I found an open sourced version of the consolizer that costs 1/3 of the price in parts. It seems to do the same method of replacing the clk opposed to just doing a small frame buffer (I believe like the LCD replacement kits do?)
But this github should be helpful to
@EZ-Flash2 in potentially figuring out the problem
https://github.com/zwenergy/gbaHD