Beginners journey - Direct mail round 2

Went to an on-line printer company tonight and got my second mailing submitted.   I boot-strapped my 1st mailing of yellow letters, probably 8 hours of work, from printing the letters in a couple of batches, the envelopes were 1 at a time - for 353 letters, this was laborious, stuffed all the letters and placed stamps on them.  Then I checked the front and if it passed QC (you'd be surprised how many envelopes didn't have stamps!) I sealed them up with a glue stick.  I think I calculated I paid about $0.67 per letter, not counting the cost of the printer ($349) and mailing list ($110).   How many calls did this generate?  Zero!  No calls, no emails, no submissions on my website, NADA!!!

Tonight, 3 weeks after my 1st mailing, I went online, selected a postcard to mail, put my picture on the front with my marketing message in color on front and black and white on back.  The format of my mailing list wasn't in snych with the on-line vendor so I had to do lots of editing to get my address's format to comply with their requirements.  I probable spent an hour or so editing them.  I paid $0.57 per post card - compare that with the letter and all the hours spent printing, folding, stuffing and stamping. 

I'm committed to 7 rounds of mailing with this list, fingers crossed round 2 yields results.