I spent nearly 20 years in Title insurance as a technician {Tile officer} and a lot of time in management. I taught college classes on Title insurance law and appeared in several trials dealing with forgeries and even did an hour in front of the Grand Jury testifying in a forgery/fraud case. Permit me to share a few things...
If someone forges a deed to your property and then sells or encumbers it by putting a loan against the property it is NOT your problem. No lender is going to loan anyone a dime without a policy of title insurance protecting the lender. That ALTA {American Land Title Association} lenders policy among other protections covers loss due to forgery.
If a lender tries to foreclose on your property based upon a loan that was forged it is the lender's and ultimately their title insurance companies problem. You cannot legally encumber property you do not own.
If a bad guy sells a property that they acquired through a forged deed {of any kind} to an innocent third party again it is not the actual owners problem. If the buyer got an Owners policy of title insurance it too provides coverage against loss due to forgery. If the buyer was foolish enough to not have gotten a policy then they are likely screwed as the actual owner still legally owns the property.
Yes, there are lots of companies out there trying to scam you out of money by offering protection that you in all likelihood already have. Buying this coverage is simply searching for a solution for which there is no known problem... the government does this a lot, but I digress. As noted above many counties offer free title monitoring services which is probably a good idea but not a substitute for an actual policy of title insurance.
In most {but certainly not all} venues the buyers Owners Policy of Title Insurance is typically paid for by the seller which is appropriate. Who better to bear the cost of guarantying the buyers title than the seller. When you are purchasing a home always insist on the buyer providing you with an ALTA Owners policy of title Insurance. But, the cost of title insurance like most things in any business transaction is always negotiateable. NEVER buy real estate without being protected even if you have to bear the cost of the policy.
Full disclosure... i have been out of the title business for 30 years but in that time have purchased/sold a number of properties in California and Arizona. When in doubt seek competent legal advice.