Starter pack is actually a pretty good value as currently priced. You are essentially buying crowns at regular price, and getting an extra house earlier in the game for free. I highly doubt it will go on sale.
Yeah Starter Pack are the best value of everything in the store, it would be silly if that went up for sale. If anything deserves a discount, it's the estate...
The estate that provides those 3 workers is not available at any age, unless you pay the $50. Of course Nexon could change this in the future, but I doubt they will.
Getting access to the early houses is HUGE. Not only you getting crowns worth at normal prices, the house is essentially FREE ( costs 3 million gold to buy I think thus more potential crowns saved) + you can develop more easily. You will be benefitting from them for 2+ months or even more....