Ruben123 - You must have very cheap - "New with Warranty" 1000Ds with 840mm lenses - or even just with kit 18-55mm...!
In Australia the 1000D with kit 18-55mm is AUD$605.00 - about US$560.00. The pre-release US price on the SX30 is US$430.00.
The sorts of folk choosing between a Bridge Zoom and an Entry-Level DSLR are Hobbyists (like me) - who'll also want some Zoom Range with their DSLR.
The cheapest "to-300mm", 450mm on a crop-body - lens worth buying (here) - is the Sigma 70-300mm DG APO - which costs about AUD$300.00.
So - to do their "Family and Hobby" snaps - with a 1000D, they'd be looking at about AUD$900.00 here. The SX30 - just guessing, from buying a Fuji HS10 recently, compared with overseas prices for it - might be about AUD$550.00.
On tight family budgets, that's a $350.00 difference.
So if the Bridge Zoom does "adequate" - for hobby purposes, stills, has HD-Video, and is fairly easy to use, that's pretty attractive to average suburban families and more.
Recently, I chose between a Fuji HS10, and a Pentax K-X - obviously a vastly superior IQ-etc, camera. With the Sigma 17-70mm as-kit choice lens I'll want as a basic walk-around lens, it was AUD$799.00 - about US$740.00.
The HS10 was AUD$545.00 (has since come down to just over $500.00.) The finances would have just stretched to the K-X and 17-70mm. But, I wasn't sure that I knew enough to use a DSLR properly - and the K-X replacement was already in the 'rumours". So I went HS10, and I'm being well entertained by it. It also, when suitably persuaded, takes pictures...
I will go DSLR - and it'll be a Pentax, likely the new K-R, in a few months.
Already I do have some older lenses - Sigma 100-300m and Sigma 28-80mm K-mount, and SMC 55mm f/1.8 screw-mount as a "first prime" to play with, plus some other M42 screw-mounts...
So I'll have a lot of learning to do - which is nice - for a Hobbyist...!