Why do you have to be like that? The desire to tether is not unreasonable. Instead of accepting mediocre service,
Pricing
Unlimited Data Plan for Phone as Modem $49.99/month*
includes Wireless WAN
no overage charges
Simply Everything
GPS: Unlimited maps, turn-by-turn directions and more with Sprint Navigation for Sprint and PowerSource phones, or TeleNav for Nextel phones. GPS reliability varies by environment.
Sprint Mobile Email: Access multiple personal email accounts in a single application on featured phones. Providers include: AOL, Windows Live (including MSN/Hotmail), Yahoo! and Gmail.
Sprint Mobile Email Work: Access and manage your corporate email and contacts on the Samsung Instinct, and other compatible phones - multiple personal, Web-based accounts too. Supports Microsoft Exchange 2000/2003/2007 accounts (via your phone's Microsoft Outlook client) and Lotus Domino 6.0/6.5/7.0 accounts (via Desktop Redirector software you can download to your PC and then use to direct email to your phone).
Sprint Music Premier: 99¢ music downloads and unlimited access to more than 150 channels lets you listen to millions of melodies.
Sprint TV® Premier: Your favorite shows on the go with more than 20 channels to choose from including Ellen DeGeneres On-the-Go, Comedy Central, MTV, Discovery, Nickelodeon and more.
BlackBerry® Internet Server (BIS): Manage up to 10 different accounts with a simple three-click email setup, and IM on the go with Yahoo!® Messenger, AIM®, Google Talk and BlackBerry Messenger. Please note: BlackBerry Enterprise Server (BES), which provides secure corporate email access and access to corporate IT administration, is not included and available for an additional cost.
Messages: Unlimited nationwide, text, picture and video messages to anyone on any network.
Direct Connect® and Group Connect®: Unlimited instant connections, nationwide and at the push of a button. Group Connect is limited to 20 participants on the same network.
Phone as modem or tethering: not included.
Corporate, government or special discounts: Do not apply.
Simply Everything: Corporate, government or special discounts do not apply.
This is just an example of Sprints charges for tethering... Why do you consider AT&T having mediocre service? AT&T does offer it but not on the iPhone. Here's the link http://www.wireless.att.com/businesscenter/solutions/wireless-laptop/laptop-connect-devices.jsp
And pricing is here: http://www.wireless.att.com/businesscenter/popup/dataconnect-comp-table.jsp
It does look like it's about $15-25 more, but the option is there, just not on the iPhone.