BLMetrics gives you a real competitive advantage on Bricklink : better pricing data, smarter part-out decisions, store insights that most sellers simply don't have and helps in your parts buying process with store arbitrage and pick a brick module.
But that advantage only works if it stays exclusive. If every store on Bricklink had access to the same data and tools, the edge would disappear for everyone.
So access is capped at 1% of the Bricklink stores trading in each country. The edge that counts is the one you have over the sellers you actually compete with, so the limit is measured in your own market rather than worldwide.
That is your guarantee: no more than 1 store in 100 in your country can reach the same data and the same tools as you.