That's probably the easiest way to deter piracy: price it reasonably for it's job. Most people would rather get it legitimately than pirate it.
Price is really the crux of it. Price it more cheaply and more people will buy it rather than pirate it. It really is that simple. All the other anti-piracy methods are merely delaying tactics. Piracy will always happen, regardless of the protection.
The problem is finding the balance of price to sales that you're comfortable with. Digital stuff is weird in that the "startup cost" of the very very first copy is stupendous, but all subsequent copies cost mere cents to produce. So selling something for $100 bucks to 10 people (and have 1,000 people pirate it), is nowhere near as profitable as selling it for $10 to 1,000 people (and have 10 people pirate it).
A real life example:
In the 1990s in Hong Kong, the VCD black market was huge. Legit VCDs went for HK$150-350 (US$20-45), recent movies being at the top end. Organised crime cartels sold them for HK$100 (US$13) for four movies, in temporary shops (they'd stay open til busted, usually about 2-3 months) making enough profit to run the risks of imprisonment, fines etc. No legislation or customs task forces could even make a dent. Shops that were shutdown would reopen either close by or in the same shop within a week or two.
Eventually, they finally found a way to put an end to the piracy: the legit VCD makers started charging HK$35-80 (US$5-10) per movie. Overnight, the pirates disappeared. Even though they were still charging more than the pirate outlets, people preferred the legit copy.
As a footnote, amusingly enough, the movie industry didn't take the lesson on board and tried the same overpricing the product foolishness with DVDs and more recently with BluRay. By then internet-based piracy had gone mainstream, offering not only really cheap movies, but far more choice and convenience. The triads didn't bother nearly as much (or at all in the case of BluRay), because the money wasn't there, so organised piracy was much less of a problem. Instead individual piracy took hold. This time it's the legit DVD/BluRay sellers that are closing down, killed off by the movie companies' refusal to accept the reality of the market: people aren't willing to pay that much for movies.