Direct Mail Question

[Solomon Oh]

Dear fellow investors-

I am putting together an epic marketing plan to distribute letters to a couple lists.

My question is in your years of experience, is sending a campaign by depth (An initial letter followed up by a series of 4 more letters) or width (a mass amount of letters sent once) more successful in converting leads into deals? Obviously the best answer is both, but I am under a financial constraint ($1K) so I am trying to maximize ROI on every dollar spent.

Your feedback and insight is appreciated.