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Trump’s rallies didn’t help him in Iowa.
Get a clue.
The number that I've read in multiple sources was that Cruz had 12,000 volunteers in Iowa. So, 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 members".
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. Didn't Cruz say he'd spent more than the next 4 (in spending) candidates combined?
I believe I could win Iowa, with a machine like that behind me. This is great, if it can be sustained.