It is correct that to apply for a room in the GM Housing Block, your group would have to meet the 800 player hour threshold.
And yes, even one person can be a group, but a room is not going to be given to a group of one.
So it seems to me that you might consider combining with another group who doesn't meet the required 800 hours, and together, qualify for a comped room. If you've been running for gen con for that long, the long-standing relationship part is met.
Course, this does then mean sharing the room with the folks in that group.
room shared and comped > room unshared, oob, not compensated in any way UNLESS
You're in a position similar to mine, where although I am running enough events to qualify, I am bringing along two daughters and a granddaughter, and while the one daughter is fine with staying anywhere, the one with the one-year old wants to be walking-distance close, or she isn't coming. I was unable to get downtown in block, so no reimbursement for me. Such is life. I am still haunting the housing portal, so that may change but for now...it's out of block.