This is kinda a rough estimate, but perhaps around 6000 in total?
I think it's probably around 5000 actually.
Remurr has a 3.5k ID at the very end of 2007;
December 28th, 2007. Joined the forums on January 1, 2008. 3503
So we can assume '08 started with 3.5-4k IDs.
I have 7482 in September, so roughly 4000 IDs in 9 months.
I think it's fair to assume in the last 3 months of '08 that we at least reached 8k IDs.
Unless I missed them, no 9k IDs have given an accurate date.
I guess they either came December or January. Leaving '08 with either 8 or 9k IDs.
So a fair guess is that 4500 to 5500 IDs were sold in 2008.
Which at the then price of $20, was worth $90,000 to $110,000.