Ooh, controversial one this.
I think part of the problem is that some teachers were never told the real reason why Sparklebox was banned, moany think it is to do with internet security or identikit classrooms.
Some teachers don't see whythey should have to throw away all their resources, after all they are not endorsing him.
However the fact remains that Daniel Kinge still earns money everytime someone clicks onto his site.
There are many teachers on TES who are against their schools using Sparklebox and would like some parental backup. If I were you I would write a letter of concern to the Head outlining your reasons why you think the site should not be used.