Considering there's just over 5000 that PCGS graded already of lowell W, .25% of all lowells, it's early to tell, but nothing has graded over a MS67 so far, so MS67 is top pop with 13 examples. I doubt MS66 will settle at $8-$10 dollars unless all of a sudden, hundreds of MS67s pop up and MS68s and MS69s appear, which isn't likely either considering these won't be coming from mint sets, and there's just 2 million of each design being made, not 230 million.
Absolutely Raw coins will I think be in the $8-10 category, and under MS65 likely won't be worth the grading fees in the end, but MS66 and MS67 will absolutely have a premium and worth grading.
They are selling for 200-300 right now on ebay, and I don't expect that to drop much. The MS67's are selling for $1000- $2500 from any of the major grading companies. will it come down some? Yeah probably, but not all the way down to $10. Maybe $150 or so for a MS66.
If you keep looking you will find a cleaner example that might be worth grading it, ideally MS66 or better I think, that one will grade low.
Hard for me to gauge what NGC and ANACS are doing with the grading though, that info isn't so easy for me to find like PCGS. MS64 and MS65 seem like the very common grade, if it stays it's course I think Ideally below that won't be worth grading, but above MS65 could make you some money and be worth it, vs. a raw coin.