How Do You Deal with Freebie Requests

I am constantly bombarded by bloggers and IGers and other social media people asking for samples to review.  Some have 100 followers some have 100,000s of followers.  I am constantly torn on what is ethical.  I feel like it's a "paid" advertisment which makes me feel yucky and they are just trolling for free things, which upsets me.  But then I know some of these people are running a business and they've worked hard to be where they are with their followers and they do have value.  I would LOVE to hear others opinions and what they choose to do and their thoughts on the issue.  I think a lot of other people would too.

Where Do You Love to Sell?