You don't have to make large purchases of iTunes credit. Just enter your debit card details into your apple ID account, then when you buy individual songs it will charge that small payment to your bank account each time.
iTunes giftcards are just that: gift cards. For gifts. Like buying someone a $20 amazon voucher. They are not the only way to purchase things on iTunes.
Paypal is not necessary either. Paypal is merely the 'facebook connect' of online payment that is compatible with many sites' check-out systems, so you don't have to enter your address and card details every time you buy something off a website. I don't see the point of paying for iTunes stuff using Paypal as a proxy unless you're one of those super paranoid people who want to keep every single transation in one place.
iTunes giftcards are just that: gift cards. For gifts. Like buying someone a $20 amazon voucher. They are not the only way to purchase things on iTunes.
Paypal is not necessary either. Paypal is merely the 'facebook connect' of online payment that is compatible with many sites' check-out systems, so you don't have to enter your address and card details every time you buy something off a website. I don't see the point of paying for iTunes stuff using Paypal as a proxy unless you're one of those super paranoid people who want to keep every single transation in one place.