Chris,
Agree with you that sealing block paving is a subjective issue, even with Resiblock, I personally don't up-sell it as I can't agree with all the claims that suppliers/producers claim.
Sealing PIC totally agree with you it is a must do, but we don't do PIC.
I don't have an issue with Smartseal, just that people that have bought in to the hype, and have a website done by them, is no better then anyone else that is working in the same area with the Smartseal brand and down here (do a google search for London or Surrey) the market seems flooded with them, so in my opinion stand alone, be a bit different, it works for us.
Any website is an online advert, but when you look at anyone with a Smartseal site what makes any of them seem different from the next Smartseal "agent"?
On most they are all stock/template photos, wording etc no individuality.