Depending on the content of the host site, these offers can increase.The people who wish to use your site are usually very knowledgable on internet circulation ratios and value for money returns. They are not going to offer you great rewards from possible link backs to their site. You may also have the disadvantage of a very well worded contract, which could commit you to long term issues. These are things worthy of a serious consideration, and I would strongly suggest that you have a legal consultation with someone who is very knowledgable on contract law before you commit yourself.
I would further suggest for consideration, that your site could have certain intrusions like pop-ups that your present viewers and users are not going to be very pleased about.All for £100.00!.