No problem. Also if selling is an option, parking can allow you to
1... make some money while you wait, letting you set your price much higher as you will be earing money as it waits.
2... it adds liquidity to the name, as it opens the door to parking buyers, or proves a sites has people looking for something.
Do note though, that sites don't earn randomly. People are showing up to that site for a reason. Parking a site will likely cause traffic to decline over time
Also it takes a Lil while to test the name out. Give it at least a month before you change your mind because it takes some time for relevant ads to begin showing up