I’m on a very tight budget, and therefore – can’t buy as much as I would want to buy. Therefore, I do new reviews when I can acquire a product or service. Simply put, if it can’t go in my budget, I can’t buy it. If I can’t buy it, I can’t review it.
If a company was to offer a product for me to review, I will review it, and disclose the fact on the page. Also, if I didn’t need to return it, I will disclose that as well.