I have had symbian smartphones (and geos before symbian) from Nokia for about ten years, and the Ovi store has come only in the last few months, in response to Apple and Iphone.

Before it, software has always been sold for smartphones, either from the developer's site, or by online shops like Handango. Some applications were luckier then others. Furthermore, I can assure you that each and every non-free application has been cracked and distributed by a huge number of forums throughout the world, in every language you can imagine. No certificate, no capability, no drm, nothing has ever stopped cracking in the symbian world.

So, don't stick to Ovi store, all this money isn't going to be worth spending. If your app is good you can sell it from your (humble) site via paypal, and word-of-mouth will be enough to make it popular. Just be prepared to the fact that it will be pirated because human nature works this way.

Just my 2eurocents.