For my own part I find blogging a useful way of thinking aloud, especially when mapping out new enthusiasms. In fact, blogging about these has proved to be a great substitute for actually spending money on figures and models which would most probably just end up on the lead mountain! Although the virtual lead mountain of declared but unfulfilled intentions is more public and equally embarrassing, it costs virtually nothing and doesn't require any physical storage space.
I've even found a parallel solution to cure my rampant book buying. I now add books to my Amazon Wish List instead of hitting the Buy Now button. Before I get round actually to ordering them the respective enthusiasm is most likely to have been replaced by a new one.