There must have been computers with 6502 and DRAM.

For higher memory capacities, e.g. 32 kB, 48 kB or 64 kB, static RAM would have been too expensive and too big, even if 6502 did not have an integrated DRAM controller, like Zilog Z80.

Using SRAM instead of DRAM meant using 4 times more IC packages, e.g, 32 packages instead of 8. The additional DRAM controller required by DRAM would have needed only 1 to 4 additional IC packages. Frequently the display controller could be used to also ensure DRAM refresh.