This is why I have only ever bought DLC for Fallout 3. I recently played Deus Ex Human Revolution. Game is $16 now. Guess how much the DLC is? $15. lol not happening.
Some of the DLC prices are getting absurd and Deus Ex's DLC was one of them. Skyrim's Dawnguard ($20!) was another. The thing with those though is that they'll end up on sale eventually. Deus Ex's DLC was just 75% off and Dawnguard was half off. Bioware's DLC on the other hand is never on sale. All of the ME2 DLC's are the same price as they were when they were released:
http://social.bioware.com/page/me2-dlc
Even though Dragon Age Origins Complete was just on the steam holiday sale for $7.50 if you just picked up the regular edition and wanted some of the DLC they're still the same price as 3 years ago:
http://social.bioware.com/page/da1-dlc
Even the terrible ME1 DLC pinnacle station is still $5:
http://store.origin.com/store/ea/en_US/pd/productID.152041300
I thought that with ME3 on Origin you might see the DLC on sale eventually but so far no luck.
As for the op I don't blame you on passing at those prices (although the cost is $20 for both, not $25 IIRC). You're still going to want to check out shadowbroker on youtube and I'd still recommend considering it especially if your shepard is romancing Liara.