Up here in MN white suckers are often sold as "Pike minnows" or "sucker minnows". People use them for pike and musky. And they fetch a fair price for a 3" minnow, ussaly over 50 cents apiece! Gollon Bros. sells suckers up to 20" for musky bait, I wonder how much those go for.
If white suckers do spawn in a pond with out water flow would it work to use them as a monoculture? In some ways it might be like free fish (after you pay for the pond), they wouldn't need to be fed or managed, just harvasted.
I was thinking a fairly small pond, maybe around an acre or two and deep enough not to freeze out, full of bait. It would be non-drainable, harvest would be done with a fyke net, cast net or siene. The ones that were to large for bait could be returned as breeders and the others used as bait.