Actually I cleared 2500 raked hands quadding the NL$5 at partypoker in about 9 days when clearing out topbucks40, topbucks50 and initial deposit.

It's not about your skill level, it's about the fact that even at those limits most tables average $2 per hand and you're paying $0.10 rake vs higher rake at higher levels. For example, after clearing the 3 bonuses I had payed about $11 in rake...why play any higher unless you need to (ie I played about 300 hands raked at $10 last night just because I was running out of time on topbucks50)

Overall I ended up $410 with bonuses, a copy of PO2, never went down more than 2 buy-ins (cept initially at the $10 last night with some river beats) and payed around $11 in rake...I'd say playing the NL$5 is worth it if you trust your skill.