I think you might be the only one using 32-bit MAME any more.
MAME 0.178 32-bit Downloads = 6,731
MAME 0.178 64-bit Download = 12,639
So there are many, many other people who still use 32-bit MAME. In fact, one third of MAME users use the 32-bit version. That's an incredible amount of people.