Do you park your domains with adsense to gain revenue?

I have one new domain so far that is parked with adsense. On the first day of adsense it generated 3 clicks, a dollar a click. It wasn't much for the first day due to the clicks but the keywords were highly paid. But now it seems that the keywords have lowered to less than $0.40 a click.

Do you think parking with adsense is overall beter?