On average, a shell costs £15, 5 letters in "shell"/£15 = £3. £3*17173 total H's = £51519, which can buy you:
1 luxury model car (around £40,000 - £50,000)
Extended trips around the world, including first-class flights and 5-star stays
Minor property renovations or home improvements (often £15,000 - £50,000)
A LOT of staplers
Much more stuff that I don't even know if I can list them all