I can look for a paper book in a library, I can add it to my wish list at Amazon if the book is there, it is not always a hard cash investment.

And I love to read good reviews here, they spare me a lot of time I would otherwise use researching a service or product.

For me a good review of a paid resource must mention the price ballpark so people have a choice to follow the link or not. May be OP is just a happy customer and not affiliated with them in any way but IMHO the parent comment really sounds like a guerrilla marketing ad for me.