Just to stick it in and twist because the nature of the thread begs of it and its repeating.
"How many Steam games do you own?"
Zero. You also own zero. This is Steam. No one who uses Steam "OWNs" Nothing. You have transacted currency to "subscribe" for a "license" that is arbitrarily revokable as any and all transactions are not in any means a contract between you and the organization distributing the subscription. All transactions retain zero value and upon forfeiture or termination of said subscription no monetary value is applicable to any purchased licenses nor will any recompense be provided at or after the point of severance and access will be discontinued.
Now, excusing the "technically correct" answer to be on topic, I am uncertain any more. Steam has chosen to implement policies that effectively hold my library hostage in exchange for voluntary compliance. So it has been a while since I last saw it. Before that policy I "Think" I was pushing 150, with an estimated (non sale/Indiebundling) value of 1500$ at the time.
Honestly, it is actually good they did do it in order to force me to break ties with Valve and Steam as I was as guilty as anyone of buying crap I would basically never play but I would tell myself I "might" someday and bought it simply because it was on sale.