Leaserig is even too expensive for mining Scrypt in a multipool. I have to think about setting up my own dedicated mining rig, but what happens with my GPUs, when Scrypt ASICs get cheaper? I think they will get worthless, but there should be another way to earn BTC with GPU power ....
Yeah, it won't be easy to turn a profit leasing. If that worked, the leasers would just mine themselves. Build your own rig, but yes, it will likely become obsolete eventually. That's why it's a bit of a gamble.
Also:
...there should be another way to earn BTC with GPU power ....
If you think that the whole point of Bitcoin is to allow people to make money with computing power, you're sorely mistaken.