Yes, that's right. It seems that the editing community of StarCraft 2 has produced more than 65K mods for just under four months.
And actually, this is not the best part. First of all, those numbers come from Blizzard CEO Mike Morhaime himself so there should be no doubt in those facts. He presented this number on Blizzard's last financial conference. Second, those 65,000 thousands are from the North America users alone, which would make the total custom map count even larger.
Furthermore, Mike Morhaime has also discussed the Marketplace feature of Battle.net which would at some point allow map makers to sell their creations to the community. However, specific times for the integration of the Marketplace were not announced.
Links
Bigdownload.com - Source