Hello @Schr0ding3rscat,
Welcome to the forum!
The own Blockchain is useless for storage offering, it requires additional resources from SNO, and will distract developers to invent and support another wheel. As you can see on SIA example, the mining is more profitable than offering space and if we invent an own Blockchain it would finish similar.
We do not want to offer another useless coin and build another one Blockchain with the only purpose to pay to storagenode’s operators. This also would be more complicated for customers, not all of them is ready to use unknown coin to pay for service, also having ERC20 token and coin in the same time will confuse many of them. Use only coin could create a hype around trading and complicated legally problems too. I even did not mention that it is another one migration, which is not desirable: