Not to disparage the effort at all, but Cruz got 4.3041 votes per Cruz team volunteer. The ratio would be lower if paid Cruz campaign workers are included, making the denominator “Cruz team member”.
I’ve not seen an exact number for what Cruz and Cruz supporters spent in Iowa: It’d be interesting to know how much each vote cost.
Also, for all that effort, these precinct caucuses are only the first step. Next are the county conventions. Iowa has 99 counties. Delegates to these conventions are based upon the proportionate number of votes each candidate received in the precinct caucuses, if my understanding of the Iowa system is correct. The delegates to the National Convention are a result of process that goes from the precinct caucus to the county convention, to the district convention, and the state convention.