In the end you're still just asking for a block, you don't pay for it. There are requirements which vary from RIR to RIR, sure, but there were requirements for requesting blocks in IPv4 as well originally.

Ultimately, as a regular person requesting IPv6 space you'd just ask your ISP, which can get practically as much as they want for free by submitting these kinds of requests. Meanwhile, for IPv4 space they're going to have a harder and harder time getting you additional space and chances are be unwilling to give it free/cheap.

> as a regular person requesting IPv6 space you'd just ask your ISP

In real life these requests don't lead to IPv6 allocation, no matter how they're asked or how often. Here are a few of the responses I've received just this year.

    "At this time we are not able to provide a IPv6 unfortunately."
    "We regret to inform you that, at this time, we do not offer IPv6 support."
    "I wanted to inform you that IPv6 is currently not available"

Past that: Over 15yrs of asking various ISPs (large and small) to make allocations available, none of us ever budged the IPv6 needle.