There's nothing at all wrong with being a broker in this business. Just keep it above board and we'll all be copacetic.
As for the rest of your confession..... none of it's needed. You conduct yourself however you wish and do your thing. Come here, ask questions, get good insight on things lotsa other people don't have a clue............... but don't for a second think we'll give you much help if you're gonna try to use this information to put some legitimate sign shop out of business.
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Anyway, you probably have everything worked out in your head, so I invite you to really take a hard look at your game plan and re-visit how you intend to be the go-between for the transit companies and the sign shops you are aligning yourself with to do this.
Ah, I see the disconnect. I'm brokering the advertising space, not the signs. The signs are a tool, not where I'm looking to make money. I want to have a little knowledge to be able to be able to explain the process to clients on either end and to make sure my sign contractors are recommending the most appropriate (cost and performance) materials. More business for the sign shops, not less.
Thanks for taking the time to reply.