Of interest:
reddit.com/r/churning
The offers can be more lucrative if you focus on travel instead of cashback, but if you don't like to travel, then it's kinda pointless. Also, absolutely don't do it if you're within 12-18 months of a major purchase (house, car, etc).
My wife and I are slowly going through this process so we can take a free trip to Europe. We're not people that do 5 cards each every 3 months, but I've had 6 in the past 10 months and she's had 3 in the past 5 months. We'll each have 2-3 more by the end of the year, at which point we'll be booking our trip.
In a little less than a year, we've cashed in ~$1000 for statement credits or direct deposits (only from programs that are purely "cash back") and have roughly $3500 worth banked in various airline/hotel programs. If we redeem for travel like we're planning, that $3500 will be worth closer to $12-15k (business class flights to Europe, 10-12 free hotel nights in 5* hotels, etc).
OP, for some of the larger offers (mostly travel related), check out the Chase Sapphire Preferred ($400 after $3k, worth $800+ when transferred to a partner and redeemed for travel), Chase United MileagePlus Explorer (use
Flyertalk thread to get 50k miles after $2k spending instead of 30k miles after $1k, worth 1.8-2.0 cents per mile for most flights), and Barclays Arrival World Mastercard ($400 after $3k, must be redeemed for travel expenses, get 10% "points rebate" after redemption).
I like the hotel cards that give free nights on your anniversary after paying the fee -- the IHG Mastercard has a $49 AF but you get a free night at ANY of their properties, including intercontinentals. The Club Carlson visa gives you 40k points each year for a $75 annual fee. The Chase Hyatt card gives you a free night at category 1-4 hotels each year for a $75 annual fee. Those cards each also have pretty good signup bonuses available -- 80k points after $1k spend for IHG
here, 85k points after $2.5k spending for the Club Carlson (and you get the last night free on points redemptions of 2 or more nights, essentially 2-for-1 if used properly), and 2 free nights after $1k spend on the Hyatt (at any property, no category restrictions).
As for the credit score, if you don't let a balance report (as in, charge $0 to it, or if you do charge, don't let it hit the statement) on more than 3-4 cards, you'll only see a small short term negative effect from the inquiry and average age of accounts but a long term positive effect from available credit and your utilization ratio. And obviously, if you carry any sort of a balance that isn't paid off in full before the due date, this isn't for you.
The thought of juggling a bunch of credit cards for rewards makes me tired. I have plenty of money, a couple of cards that give good consistent rewards, and a low stress life outside of work.
Autopay + email alerts to watch for spending on your dormant cards.
Excel spreadsheet to update your points balances periodically.
Takes hardly no time at all, any charges you make go on whatever card you're currently chasing the bonus for. There's no card juggling =)