People didn't choose IDA Pro just for quality. GHIDRA was highly restricted. Even the people with access to GHIDRA were hesitant, because they didn't want to learn a tool that they couldn't take to another employer.
The other players in this market, binja (Binary Ninja) and Hopper Disassembler, are much newer. Inertia keeps them back. Imagine introducing a new editor, like vi or emacs, but with everything just a bit different. It could even be a slightly better editor. Uptake will be slow. People don't want to relearn or repurchase.
Until recently, normal people could only choose IDA Pro. You paid, or you had to suffer with awful substitutes like Radare2 and objdump.