I'd suggest two ways:
1) a last-52-weeks rank like in tennis. This would require a big database though and make licences less usable: if you don't race for a year, you gradually go down to copper.
2) licences based on quantiles. q<0.1% = titanium, 0.1%<=q<0.5%, - platinum, 0.5%<=q<2% - gold, 2%<=q<5% - silver, 5%<=q<20% - bronze, 20%<=q<50% - copper.
In both cases a person can't be sure of own licence and accessibility of hosts.
The issue with ranks and accumulating points regards the emotional payoff and motivations of players. The payoff from CTRA comes also from posession of a high-level licence. Just the same as in WoW. It gives the same feelings as in real life (tho, the number of people who admire your licence is much smaller than the number of those who would admire a luxury RL posession). Anyway, this still motivates many players. The problem is that if this system is removed or made more complicated, those who were motivated this way, will leave.
1) a last-52-weeks rank like in tennis. This would require a big database though and make licences less usable: if you don't race for a year, you gradually go down to copper.
2) licences based on quantiles. q<0.1% = titanium, 0.1%<=q<0.5%, - platinum, 0.5%<=q<2% - gold, 2%<=q<5% - silver, 5%<=q<20% - bronze, 20%<=q<50% - copper.
In both cases a person can't be sure of own licence and accessibility of hosts.
The issue with ranks and accumulating points regards the emotional payoff and motivations of players. The payoff from CTRA comes also from posession of a high-level licence. Just the same as in WoW. It gives the same feelings as in real life (tho, the number of people who admire your licence is much smaller than the number of those who would admire a luxury RL posession). Anyway, this still motivates many players. The problem is that if this system is removed or made more complicated, those who were motivated this way, will leave.