You're falling into the trap of using your house as an ATM.

“Drug-related illegal activity” means the illegal manufacture, sale, distribution, purchase, USE, or possession with intent to manufacture, sell distribute, or USE of a controlled substance (as defined in Section 102 or the Controlled Substance Act (21 U.S.C. 8002) or possession of drug paraphernalia.2.Resident, any member of the resident’s household or guest or other person under the resident’s control shall not engage in any act intended to facilitate illegal activity, including drug-related illegal activity, on or near the said premises.3.Resident or members of the household will not permit the dwelling to be used for, or to facilitate illegal activity, including drug-related illegal activity, regardless of whether the individual engaging in such activity is a member of the household.4.Resident or members of the household will not engage in the manufacture, sale or distribution of illegal drugs at any locations, whether on or near the dwelling unit premises, or otherwise.5.Resident, any members of the resident’s household, or a guest or other person under the resident’s control shall not engage in acts of violence, or threats of violence, including but not limited to the unlawful discharge of firearms, prostitution, criminal street gang activity, intimidation, or any other breach of the housing agreement that the other wise jeopardizes the health safety or welfare of the landlord, his agents, or tenants.6.VIOLATION OF THE ABOVE PROVISIONS SHALL BE A MATERIAL VIOLATION OF THE HOUSING AGREEMENT AND GOOD CAUSE FOR TEMINATION OF TENANCY.

Since then, we got bi-monthly treatment for both rodents and insects, which costs approximately $400.00/year.

I've got to look over those numbers to be sure, but God help me I'm actually considering an adjustable rate mortgage.I guess my question is if those numbers are accurate, is it worth the risk of being trapped in 10 years?

Do not get yourself in the trap of depending on her rent and not wanting to get rid of her due to the pain of finding a new tenant.

I've already suggested to him to get traps and buy those pest deterrent devices from a home improvement store. 

Even if someone were to pee into a trap, you should not smell it with proper plumbing.  

Anyway Told the tenant to get some traps bait/ poision.

The goal is not to make her feel trapped, circle the wagons and say "evict me b/c I have no where else to go." 

So, in other words, if a GI Joe is pulled out of the trap by a plumber, tenant pays.