1. Paypal Doesnt reset Sending Limits. You have 100$ Sending Limit for Unverified accounts and thats it.
2. It is kinda GONE till you have 150$.....then you can order a Cheque or you can verify your account to raise the Limit.
3. Yes, people sell Virtual Credit Cards for verifying Paypal, Ebay, Adwords etc but 5$...... is no doubt a scam. The Cheapest i have seen is 10$ with Instant Expanded Number.
There is a forum...called
http://talkgold.com/forum/f18-.html where you can find VCC sellers. BE CAREFUL : LOADS AND LOADS OF SCAM. So dont go for cheap sellers. There is an Indian Guy with name "HyipGrace" selling VCC for 10$ for a long time and respected there. You can ask him.
http://talkgold.com/forum/r133208-.html
Take my advice, always go for a seller who can give Expanded Number Instantly or your account can be useless....if his bank screws seller up and cannot give expanded number the very next day.