Thank you for your question. I am not familiar with IJCSA. I went thru Betco.com online training which was free at that time, but may cost $ now.
I think facility managers/property manager may take a closer look to see if you have certs. I do get asked by some of my prospective customers if I have any certs and I do mention that I am/have certifications in 6-7 janitorial service areas.
But I will close with this: if my competitors have certs, they sure don't seem to advertise that they have them.
Brad BD Janitorial
P.S. unless you are the only cleaning company in town, certs help to differentiate You from your competition