I am pretty sure the bug problem with starching only happens with home made starch made with corn starch. The commercial starch, such as stay flow and spray niagara have additives in them to keep them from going bad as home made starch can. I suspect these same additives don't attract silverfish, it probably doesn't give a chemical signal of food to them. I suspect the spoilage issue is one of the reasons why many home made starch recipes say to add vodka to deter spoilage, but this may also deter bugs. Additionally upstate NY does not have as high a potential of bug problems as the more temperate humid climates like the southeast.