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Without the dynasty bonuses, you won't get many unique heroes, all the pets, starting bonuses, and exclusive maps. If we go through them one by one, that's how it is.
Unique heroes are appealing simply because they are unique. Sometimes their special abilities are also quite good.
Pets can sometimes be quite helpful in your favor. For example, who, except your opponent, would mind having a black dragon in the early battles?
Starting bonuses are extremely useful. For example, a reduced number of movement points required for teleporting to/between cities – isn't that a benefit?
Maps – for variety. The "Heart of Nightmare" scenario is especially good.
Periodically, the complete set of six expansions is offered with a significant discount, bringing its price down to around three hundred rubles, which, compared to the original eight hundred, looks very tempting. So, it's an option.