Put differently.....
1) In the case where one book has a number that you want, a deposit bonus, or you are looking for a new out - If you have an account(s) funded at other books you can request a withdrawal at that book which will go to Neteller which will then give you $$ in your Neteller account which you can then send to a different book.
2) If you lose frequently, withdraw to zero in your accounts at various books, gamble impulsively, have outs that process Neteller withdrawals slowly, etc. then I agree and going from your bank to Neteller to the book is PAINFULLY slow if you do not want to incur a fee.
3) There is a process called InstaCash (or something like that) which will give you credit to your EFT immediately but charge a sizable fee. There are a few books that will cover this fee.
Frankly, I think Neteller has a ton of weaknesses, including the amount of tie it takes for an EFT, but given the other options in the space its pretty good.