Certificate of Compliance, why ~90 percent of landlords choose not to comply?

I'm looking at the protocol to register and then have the safety and lead risk inspections, fix any issues and ultimately get the certificate of compliance for 3 years, then repeat. Or the alternatives are to receive BSEED tickets, tenants can put rent in escrow, etc. Why do around 90 percent of landlords, even ones with decent houses choose to not comply in getting the CoC?