MNBioMike - do you really think a sales rep gets 250K a year? I think you are off by a factor of four to five fold. I would say even simpler math
400 sales reps x 60K/year = $24 million for the whole year.
I think much more of this 383 million (that's what they'll have left after the underwriters get their 4 plus percent fee) is going to be spent on advertising, buying inventory, and perhaps even a supplier, than on the added sales force.
I have a couple of relatives for big pharmas who are sales reps and they don't make anywhere near what you are suggesting. Especially entry level, which is what many of these will be.