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As I understand from your question that some times to draw from the submission or don't to submit will attrack your customer.
Yes it's great tacktics & idea but you need to play it in correct way as the following:
1- you should trust that you are biggest player in the area/business of your customer
2- You should aware about the inside of your customer's environment
3- Inform your customer informal way that you can't submit for this RFP. You should know that your customer needs your company services/name/expereinces to implement this project
4- You have to be ready if the customer ask you to submit then you should ask him for your requirement
