Buyer paying cash for real estate, do we have to have a Real Estate lawyer?

If you own the home but don't own the dirt under it, it's a rather worthless investment. I would suggest that the most important thing an attorney would do is certify title. One of the many roles an attorney serves in a closing is confirming that the title aka the history of the property is clear and that the Seller can convey good clear and marketable title to you. Perhaps I'm biased but paying an attorney a nominal fee in comparison to the funds expended on the investment is money well spent. Attorney's are a small fraction of "closing costs" and yes...you certainly will still have expenses related to the closing. Recording fees, adjustments, etc.