This is why subscription streaming services make A TON of sense.  This has been my experience exactly, except for the fact that I now buy less music instead of stealing less music (I haven’t used filed-sharing services since college).  

But do you think there are more people out there who steal music or more people who buy music?

No brainer.  More people steal by far.  This is why subscription streaming services could be a big deal for the music industry (if they fully embrace the model).  They may sell less music (in the form of downloads), but they’ll also convert users of file-sharing networks (who aren’t paying for music today) to paying customers.  My hunch is that they’ll make more money net-net.  The gross revenue will never come close to what they were making when CDs were the standard, but that’s okay - it’s a lot cheaper to deliver digital so profits can still be made.

Here are my other posts on this topic:

• Subscription streaming services as the future of the music industry
• Elizabeth Moody joins Google Music
• Surveying Crowded Music Subscription Sector