Repurchases (purchases of other product from the same brand and perhaps rang) are teased ('encouraged') because you are curious to see how they convert from the one thing into the other(s).
i.e. customers are teased into making more purchases in the same range of (transformer type of) product as a result of their experience with the one they have

--------------------------------------------------
Note added at 1 hr (2006-10-21 20:16:16 GMT)
--------------------------------------------------

please read as '.... perhaps range)'

I guess, that repurchase is the result we strive to achieve. The way to do it is to tempt users with toys they already have, to buy a next toy.

My answer does not offer clear difference from Dave's and Rafal's, yet I like to back up whichever answer along these gentlemen's line of thought with the following explanation.

I am a bit confused by "repurchase" used in the sentence. As a non-native speaker, I have to consult my dictionary to confirm its definition as I understand it: buy back, not "buy next".

The author might like instead to express "repeat purchase", that is, purchase other products of the same theme and brand.

So, the sentence becomes: Repeat purchases of all models / games are teased. Teasers can take many forms (you have mentioned one -- pictures of other models, but it can cover as well: combo discount, i.e. repeat purchase of the next model along the theme will be discounted nn %). "Teased" here then means "enticed" or its equivalent synonims.