As an AI language model, I don't have personal experiences or the ability to provide real-time examples. However, I can offer you some general insights.

The amount of money required to start an e-commerce business can vary greatly depending on the industry, niche, business model, and individual circumstances. Some e-commerce businesses can be started with minimal investment, while others may require a significant amount of capital.

Here are a few examples to give you an idea:

1. Dropshipping: Dropshipping is a popular e-commerce business model that allows you to sell products without holding any inventory. With dropshipping, you only purchase the products from a third-party supplier once you receive an order from a customer. This model typically requires lower upfront costs as you don't need to invest in inventory. However, you may still need to allocate funds for building a website, marketing, and customer acquisition.

2. Private Labeling: Private labeling involves sourcing products from manufacturers, branding them as your own, and selling them under your brand name. This model requires more upfront investment compared to dropshipping, as you need to purchase inventory in bulk. The costs can include product sourcing, branding, packaging, warehousing, and marketing.

3. Handmade or Artisan products: If you create unique handmade or artisan products, the initial investment can vary depending on the materials, tools, and equipment required. For example, if you're starting a jewelry business, you may need to invest in gemstones, metals, tools, and packaging materials. The costs can also include setting up an online store, marketing, and attending craft fairs or events.

4. Software as a Service (SaaS): If you're developing and selling software products or services online, the initial investment can be higher due to the development costs. This includes hiring developers, designers, and potentially investing in infrastructure or cloud hosting services. Additionally, marketing and customer acquisition costs should be considered.

It's important to note that revenue is not the same as profit. Revenue represents the total amount of money earned, while profit is the amount left after deducting expenses. Therefore, even if someone has a revenue of $100,000 per year, their profit could be significantly lower depending on various factors such as operating expenses, marketing costs, and taxes.

It's always recommended to conduct thorough market research, create a detailed business plan, and consider the specific costs associated with your chosen e-commerce model before starting.