Should i go PAID, or in app purchase?

[mikemellor11]

Hi guys, i released my app nooms for free about a week ago, and it has been getting around 500/600 downloads a day. Its currently about 30th in the strategy category. Im not sure where to go from here, i planned to change it to paid when it got higher in the charts, but it seems to be stuck now around 30th. I don't want to put it paid then have it simply disappear from the radar. I had an idea of changing some of the worlds to in app purchases this would hopefully keep me where i am now in the charts as well. This also has a drawback though as i have sent it off for review to many websites, will they frown on a game with only some of the content unlocked? Any advice would be extremely appreciated thanks.