The most crucial disadvantage to trying to acquire tax lien properties is the long wait that goes into a tax lien expense before a deed can be obtained. Some states have a redemption period as long as 4 years (the time allowed for any owner to pay off the lien). And, after the redemption period there is often a significant wait time for the deed to really be issued by the county and a quiet title action performed (this is necessary before you can sell the property with identify insurance).
Several years ago, even though attempting to obtain tax lien properties myself, I noticed that 95% of the properties redeemed, and that using all my own available cash I could only purchase 10-20 liens each sale. This meant that I only stood to get with ki residences condo at the most from the sale. In fact , I never got any properties, all my liens paid off.
Far fewer of the owners were owner-occupants as compared to mortgage foreclosures. Of those who did occupy the property, most had been given the property through an inheritance or other means. Even today I've never seen someone who spent 30 years paying off a mortgage and then allowed the property to fall sorry victim to unpaid taxes.
Many of the property owners were deceased. I soon learned how to get deeds from the heirs and get immediate title to the property. Most states have a "small estates" provision that will allow you to get good title to the asset without a long, drawn-out probate. Since almost nobody outside the legal profession knows how to do this, you'll have a tremendous gain.
All the properties that "fall through the cracks" end up at a tax sale eventually. Maybe someone was given a property people didn't want. Maybe someone was sick of paying for repairs and taxes and just gave up being a long-distance landlord. Probably family members moved into the house and were supposed to pay the taxes but didn't.
For whatever reason, tax lien premises are the most interesting source of pre-foreclosures you'll ever find - and the profits can be immense.