I have a PR3 blog http://omar-abid.blogspot.com It got about 40.000 views in 5 months and have 150 readers. It also have 100 articles. I want to sell this blog, how much does it worth?
Whatever people are willing to pay for it. There is no telling how much it is worth, but some indicators are: i) how old is the domain (assuming you own it); ii) how many indexed pages in Google; iii) how much revenue is it making monthly; iv) traffic levels. Are you allowed to sell blogspot blogs?
I don't think you are allowed to sell blogspot blogs/accounts. But the above stated all the indicators. You might try to switch to your hosting and buy a domain. It makes it more valuable.
I have done this before, simply give the buyer administrative rights and you (the seller) become a member; no matter I want just to know how much can it worth.
Here is a post at Daily Blog Tips that I think can help you - http://www.dailyblogtips.com/how-much-is-my-site-worth/ Good luck!
I really wish I was in your shoes. I would not try selling it. I will rather blog with it. Companies like payu2blog.com and blogitive.com are really in need of you. You can make money blogging with them than just selling it. CHEERS.