Tapes are a pain. Compared to DVD discs, videocassette tapes take up more shelf space, break and get stuck in the recording unit more often, offer lower video and sound quality, waste your time cueing up, don't play on computers, don't travel well in person or in the mail, and never, ever impress the neighbors.
Preserve the memories. A typical write-once (DVD-R or DVD+R) disc should keep its contents safe for 100 years. A typical VHS recording can last as long as 20 years, but image and sound quality degradation becomes noticeable in as little as 5 years. If you want your wedding video to last 'til the grandkids can watch it, there's really no choice.
Transfer is cheap and easy. Forget about paying some jerk at the video store $25 a pop to transfer your tapes to DVD. You can get a standalone DVD recorder for as little as $100, and blank discs can cost less than 50 cents apiece. VHS-to-DVD-R decks are also relatively cheap, and they make the transfer as easy as dubbing audio cassettes.