Okay, so cue rant about agencies...
Last year, one of the agencies pretty much manufactured an application for a student out of thin air! The student in question was a middling student with nothing to really make him pop out from the crowd. Somehow, the agency managed to "polish" him into a straight-A student with multiple volunteer trips and a paid internship with a Fortune 500 company--both of which never actually happened! He ended up going to a fantastic school (Top 10) with a great financial aid package.
For this "polishing", agencies charge exorbitant amounts of money. I know an agency that charges 20K RMB for admission into each Top 20 University. It's absolutely ridiculous! And yet students (especially the more privileged ones) are more than willing to splurge loads of their parents' hard-earned money on these services. Ridiculous.
As for DIY students... Honestly, I think that their--or rather, our--interest in your guidance services would hinge largely upon the fee you require. Many students DIY because their families don't have the financial resources to hire an agency or because they are unwilling to spend so much on agencies. I myself am a prime example of the latter situation.
As for help... I go to one of the best schools in China (call me arrogant or whatever, but my chest always puffs up in pride whenever I say that!) and we rely on a lot of information from our upperclassmen. Although our school highly discourages students from heading abroad, we had a fantabulous list of acceptances last year. There were acceptances at all the Ivies, some great LACs, and numerous other wonderful institutions. If you would like to know more, you can PM me, and I'd be happy to provide you with more information regarding my school and others in China.
As for Taisha, I guess I'd be willing to help you post a message there, but I personally doubt that it will be of any use. Good luck!