If you are trying to scalp, you want to be as close to the bid, preferably, a couple of ticks higher, say bid $3. You jump ahead of the market maker in the order queue. If you get filled and the stocks move by a huge amount, chances are good, the stock option is now higher than your entry point, say $4. Now, it is up to you to manage your trade. Set a mental stop on when to get out. Use a trailing mental stop. Option price moves to $5, you could set your stop loss at $4.50 and try and get out near that price. I would give up a few ticks to close it out, even at $4.30 or $4.20. Lock in that profit when you are scalping.
The more data you can access the better. Understand multiple list and costs/benefits and challenges. Don't over-leverage as it limits your flexibility and some hedge options. Single name - single lists can be really problematic from a liquidity standpoint. Think about the contra side of your trade and what they may be undertaking as hedge - if any. Watch the trading in the cash closely. Technology will be costly so capital and scale will be need to be good size.
That $500 is one contract. Do the math. If you are trading more contracts, you can make more than that $500 a day easily. Remember, there are losses too. You have to consider that too. Not all trades will work out. This was on NVDA stock only. NVDA is a very volatile stock which can easily move $10 or more in one day.
If you are trading penny stocks, probably, you would get options for 0.10 a contract or if you were buying those lottery tickets (options way out of the money). Midcap stocks or even large caps would probably, have higher premium amounts. It is still scalping. The only difference is the premiums are higher.
It's not the premiums, but the intraday change you mean, ie. you mean a change from $3 to $5 within a day or so. This is IMO very unrealistic.
No, it is not. Depends on the stock. Highly volatile stocks like NVDA can have $7-$10 point swings during the same day from the lows to the highs. Prices move the entire day. There was one day I remember where I got $500, got in the same day and got another $300. That is in NVDA. Now, that does not happen everyday but, the wild swings happen for volatile stocks almost daily.